If I were to make the story of Hansel and Gretel into a movie using the same style that Keene used for "The Juniper Tree," I would focus the most on the real-life aspects of the story and exploit them in the film. 

First, the family dynamic should be explored further. The movie should delve into the character of the stepmother and expose her evil and selfish intentions, both toward her lack of care for her children and her manipulation of her husband. This could be done by making her a tall, slender woman with sharp features and a constant scowl.  The depiction of the father should show his love for his children, but also his weak and complying nature, perhaps represented outwardly by an shorter, average-Joe looking man. 

Second, the idea of hunger should be the main theme of the film.  We should be able to see the country-wide famine throughout the movie; through the attitude of the characters, the bleakness of the scenery, and dialogue.  The music should be somber and slow, creating a feeling of despair, driving the parents to an extreme measure. 

Finally, the witch and her house would have to contrast the representation of the family, offering safety and relief of their hunger.  She would be a sweet elderly woman, whose evilness was seen through her actions. 

Basically, the movie version would remove most of the fairytale characteristics of the story, leaving only the real-life aspects to be explored and exaggerated.